- microtime: documentation ( source)
- round: documentation ( source)
- explode: documentation ( source)
- sleep: documentation ( source)
<?php
list($msec, $sec) = explode(' ', microtime());
echo round($msec*1000) . "\n";
sleep(1);
list($msec, $sec) = explode(' ', microtime());
echo round($msec*1000);